Question

Given the equation ax + b = 9x + 21 which set of values for a and b would result in an equation with infinity many solutions

a = 3,b = 7
a = 9, b = 9
a = 9, b = -21
a = 9, b = 21

Answer 1

• D. a = 9, b = 21

Explanation:

Given the equation

• ax + b = 9x + 21

For the equation to have infinitely many solutions, both sides of the equation should be same.

• a = 9 and b = 21 will make both sides equal

Correct option is D